Manufacture of glass stone.



35 composltion.

UNITED STATES Patented March 1, 1904.

PATENT OFFICE,

LOUIS ANTOINE GARCHEY, or PARIS, FRANCE.

MANUFACTURE "OF GLASS STONE.

To all whom it may concern:

Be it known that I, LOUIS ANTOINE GAR- CHEY, a citizen of France, residing at 72 Bonlevard Haussman, Paris, France, have invented certain new and useful Improvements in and Relating to the Manufacture of Glass Stone, of which the following is a specification.

This invention relates to certain new and useful improvements in the manufacture of ever, presented some dilflculty, as the glass did not readily lend itself to the molding operation and could only be placed in flat sand molds. The manufacture of the glass stone was therefore limited to the production of slabs, flags, tiles, and the like, and these were more or less ornamented by sinking or in relief by passing them through a hydraulic press.

Now according to my present invention I obviate this difficulty by using new glass, which I pour into suitable molds of thick metal, such as cast-iron, kept cool so that the fluid glass therein rapidly becomes tacky and pasty. The new glass,which I manufacture especially for this purpose, must be readily devitrifiable and the cost price of it should be very low. Any cheapvitrifiable materials, such as argillaceous or calcareous sands, may be added to its Aluminium and lime are, in fact, the elements which facilitate the-phenomenon of devitrification. In combination with the metal molds I employ a devitrifying kiln or furnace or any system with a hearth having, preferably, a circular movement. The use of this kiln or furnace enables the movable trays or supports described in my patents referred to to be dispensed with, as the operator can now place the sand molds directly upon the hearth at the initial or starting point of its movement. As soon as the glass which has been run into the metal mold has assumed a suflicient consistency the operator turnsthe SPECIFICATION forming part of Letters Patent No. 753,694, dated March 1, 1904.

' Applicationfiled .Tuna25, 1901. Serial No. 66,006. (No specimens.)

mold upside down above the hearth, so as to cause the vitreous mass to fall into a mold of refractory material such as sand, lime,plaster, talc, or the like of the desired form vent it losing its shape.

The kiln or furnace is so constructed that the molds of refractory material containing the glass to be devitrified travel or circulate therein for the proper length of time neces sary for the devitrification; Fromthis fact I effect an important economy in fuel, as I no longer need to open the kiln or furnace doors twice for each mold, and thus by avoiding the entry of cold air the temperature of the kiln or furnace is maintained. At the same time the devitrification is eflected under identical conditions for each mold, since they all traverse one after the other the same cycle in the same time, and by this means a greater regularity in 'the devitrification is obtained, and hence in the final product. When the sand its starting-point, the operator removes it and carries the devitrified mass to a hydraulic press, wherein it receives the exact form required.

Besides the great economyv already pointed out the process further presents this important advantage over that disclosed in the patents referred to, and that is slabs, flags, or tiles having all the same thickness or depth can be obtained, which thickness or depth is exactly equal to the depth of the mold emvery readily to the ornamentation of the slabs For this purpose it is only necessary to sprinkle the bottom of the mold with enamel-powder or with glass fragments with which it is desired, to cover the face of the slab, flag, or tile to be made.

The glass stone is capable of receiving with remarkable facility any galvanic deposit, and particularly that of copper, this latter adhering perfectly to the surface of the stone, as the same is more or less rough. The coating or plating of copper may be subsequently worked,

polished, engraved, or otherwise treated, or it mold containing the devitrified glass returns to or flags either by enameling or incrustation.-

placed on the hearth to receive it and topreployed. Moreover, this process lends itself may be further covered with another galvanic deposit. a

As the glass stone is an excellent electrical insulator, as its resisting qualities have placed it in the front rank among building materials, and as its mode of manufacture allows of any form being given to it, said glass stone or in general all devitrified glass when covered with a deposit of copper on certain of its parts constitutes a determinate body presenting in itself a novel use and of such nature as to give rise to numerous industrial applications, particularly for the manufacture of-all articles or objects capable of conducting on certain of their parts and insulating on others, such as insulators for currents of high tension, condensers, electrodes, &c.

Having thus fully described my invention,

nesses.

LOUIS ANTOINE GAROHEY. Witnesses:

EDWARD P. MAOLEAN, ALFRED FREY. 

